Pesach Sheni (“the Second Pesach”) is celebrated on the 14th of Iyar, a month after the eve of Pesach. The Torah (Bamidbar 9:6-11) relates that in the first year after the Exodus, when the Jewish people were preparing to bring the Pesach sacrifice:
There were [certain] men who were impure because [they had come in contact with a] human corpse and they could not bring the Pesach offering on that day. They came before Moshe... and said, “We are unclean... [but] why should we be held back from bringing the offering of G‑d in its time?...”
And Moshe said to them, “Stand and hear what G‑d will command concerning you.”
G‑d said..., “If any man be impure... or on a distant way [on the day of the Pesach offering]..., he shall sacrifice the Pesach offering to G‑d, in the second month, on the fourteenth day at dusk....”
Anyone who did not bring a Pesach offering, whether because of impurity or even because he had willfully transgressed G‑d’s will, was thus given the opportunity to compensate for his shortcoming by bringing an offering on Pesach Sheni. (Talmud, Pesachim 93a)
One thing I'll never forget about that day (besides RaggedyDad's proposal) is how my grandfather, of blessed memory, spoke briefly back at my parents' house that night. I can still hear his voice resonating with strength, yet cracking slightly with the emotion he was prone to during such occasions, especially in those years: (paraphrased)
"Those Yidden who were late in the game for various reasons were despondent. 'Me too!' they cried to Moshe. I want to have a part in this, too! [RaggedyDad] likewise insisted, 'Me too!' and sought inclusion into a Torah lifestyle through significant challenge."
He connected RaggedyDad's and my relationship, RaggedyDad's own personal story as a Russian ba'al teshuvah, and the observance of Pesach Sheini in a way that was so poignant and moving.
Happy Engagemaversary, RaggedyDad. Thanks for asking me :)